I have one, I got it in Taiwan shop import to CN, they will not tell me much about the spec, cost me about 1700 USD with installation. They tell it should support 400 WHP.
Here is log, running JB4 & e98 METH, with e30 gas, on top of BM3 S2 e30 OTS flash.
https://datazap.me/u/rmtm/log-1576310981?log=1&data=1-4
Car is a blast, here is a 100-200 run at 10.68s, not too bad, JB4 log below is that same run, ignore first 4 seconds, spun tires in 1st /2nd had to pull off, 22 PSI on that run up top, still did 13.1s in quarter on that one, with 2.33s 60ft, take 0.4s off that with a more reasonable 1.9s 60ft, FYI 180.8 kph = 112.3 mph.
https://datazap.me/u/rmtm/log-1576310981?log=0&data=1-4
I included also 100-200 in same place but on stock turbo for compare, as 12.6 seconds, that was at same or higher boost, and also about 20 deg higher ambient temps, so that is part of it
One weird thing with JB4 it keeps lower FF (WGDC learning) even when boost is under target, you can see it in my log, the FF is lowering during the run, and boost is like 2 psi under target, by end of run it is 3 psi under, frustrating